Here is “BeatBuddy” Hydrogen drum kit that has been mapped to match the GM standard so it imports correctly for BeatBuddy.
https://forum.singularsound.com/t/beatbuddy-drum-kit-for-hydrogen/27438?u=aliby
Once I have made the song in Hydrogen, I delete sections in the Song Editor to only have the section I want as a part and then export that to Midi. I do that for each part, fill, transition etc.